Formation of 1,1,3,3-tetrafluoro-1,3-dihydroisobenzofurans in reactions of phthalic acids with sulphur tetrafluoride. Evaluation of the steric and electronic effects of the substituents
作者:Wojciech Dmowski
DOI:10.1016/s0022-1139(00)80485-6
日期:1993.11
acid and 3,6-dimethylphthalic anhydride have been reacted with sulphur tetrafluoride to give mixtures of the corresponding bis(trifluoromethyl)benzenes and 1,1,3,3-tetrafluoro-1,3-dihydroisobenzofurans in a 5:1 and 1:3.6 ratio, respectively. These and earlier results on the reactions of sulphur tetrafluoride with substituted and unsubstituted phthalic and pyromellitic acids are compared and structural
Reactions of tetrafluorophthalic and difluoropyromellitic acids with sulphur tetrafluoride
作者:Wojciech Dmowski
DOI:10.1016/s0022-1139(00)80039-1
日期:1993.2
Fluorination of tetrafluorophthalic acid (1) with an SF4/HF mixture at 190-300-degrees-C afforded, beside the expected perfluoro-o-xylene (2) and perfluoro-o-toluyl fluoride (4), considerable amounts of octafluoro-1,3-dihydroisobenzofuran (3). The reaction with difluoropyromellitic acid (5) at 190-degrees-C gave a mixture of perfluoro-2,4,5-trimethylbenzoyl fluoride (9), perfluoro-2,5-dimethylterephthaloyl difluoride (10a), perfluoro-2,4-dimethylisophthaloyl difluoride (10b) and perfluoro-5-methyl-6-fluoroformyl-1,3-dihydroisobenzofuran (11), but at 300-degrees-C perfluorodurene (6), perfluoro-5,6-dimethyl-1,3-dihydroisobenzofuran (7) and perfluoro-2,4,5-trimethylbenzoyl fluoride (9) were obtained in a 3:1:0.8 ratio.
Dmowski, Wojciech; Plenkiewicz, Halina, Bulletin of the Polish Academy of Sciences: Chemistry, 1989, vol. 37, # 7-8, p. 297 - 305
作者:Dmowski, Wojciech、Plenkiewicz, Halina
DOI:——
日期:——
Dmowski, Wojciech; Wielgat, Jerzy, Bulletin of the Polish Academy of Sciences: Chemistry, 1988, vol. 36, # 5-6, p. 195 - 202